Ninja'd -- but, yes, we consider Mac and PC to be interchangeable for licensing. Buy one, get both. I recently went through the hassle of changing my Photoshop license from the pc (where it was unbearably slow for me) to the Mac, but even prior to that experience I know how frustrating to be limited in computer os based on prior purchases. If we do versions of our games on consoles or on phones those would all be individually licensed like any other game, but when it comes to home computers we want to make it as easy as possible to play our games on multiple OSes, to switch OSes, or whatever they want to do.
Cheers, and thanks for your support!